MRCOOL DIY 4th Gen Mini Split - 2-Zone 27,000 BTU Ductless Air Conditioner and Heat Pump with 12K + 12K Air Handlers, 50 ft. Line Sets, and Install Kit


Sale price$3,874.00 Regular price$4,999.00

  • Authorized Dealer
  • Free Shipping*
  • 30-Day Return Policy⁺

Line Set Mix: 50 ft. + 50 ft.
  • Authorized Dealer
  • Free Shipping*
  • 30-Day Return Policy⁺




16.14" D x 31.89" H x 37.24" W 


208-230 V



Cooling Capacity


Heating Capacity


Min-Max Ambient Cool

5F ~ 122F

Min-Max Ambient Heat

-13F ~ 75.2F

Refrigerant Type


Max Line Set Length

147.64ft TOTAL


12K Air Handler

Product Dimensions

7.44" D x 11.69" H x 31.57" W 


208-230 V

Cooling Capacity


Heating Capacity



  • Auto - auto selects from Cool, Heat or Fan-Only
  • Dry (Dehumidifies)
  • Cool
  • Heat
  • Fan Only
  • Quiet
  • Sleep

Line Sets


16 ft., 25 ft., 35 ft., or 50 ft.

Liquid Line Size


Suction Line Size



  • Connect 50 ft. line set to 16 ft. or 25 ft. line set
  • For 24K or 36K Air Handler: DIYCOUPLER-3858K75C
  • For 9K, 12K, or 18K Air Handler: DIYCOUPLER-1412K75C

Restricted States



Proposition 65 Warning



What BTU rating should I choose for my air handler?

  • This depends on the coverage area/room size you are trying to heat/cool
  • An Air Handler's BTU is how powerful the fan is. A higher BTU rating will be able to heat/cool a larger area
Air Handler BTU Coverage Area/Room Size (Sq Ft.)*
Up to 375 Sq. ft
12K BTU Up to 500 Sq. ft
18K BTU Up to 750 Sq. ft
24k BTU Up to 1000 Sq. ft
36k BTU  Up to 1500 Sq. ft

*Ceiling height, insulation, and local climate may impact the coverage area. For example, an uninsulated room will require more power than a well insulated room.

Shipping & Returns

*Shipping Policy

  • Shipping is Free
  • Large appliances ship via Freight Curbside shipment. Meaning the carrier will drop off your item on your property not inside your home. The courier company will call ahead of time to schedule a drop off date
  • For the full details, visit our Shipping Page

Return/Refund Policy
  • 30-Day Return Policy
  • If your order arrives damaged, we will exchange you for a new one. Damage must be reported within 24 hours. 
  • For more details, visit our Return Policy Page


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Customer Reviews

Based on 5 reviews
Edward Meador
Nice unit

Very quiet operation, very heavy duty air handler, very poor installation instructions, but having 40+ years experience it wasn't too hard to figure out

Kirk Miller
It’s working

Just finished installing and can’t really give a review on efficiency or how effective the unit will be for my shop space. Installation was fairly straightforward, however, it would be beneficial that somewhere, prior to purchasing, incoming power will need to go the outside unit. I certainly would have planned running the #8 wire a little differently. I am satisfied with the purchase and excited to see the results in my shop.

Kristian Burgess
Simple and straight forward.

Product came on time, well packaged and with no damage . I am a contractor and I have had many mini split systems installed in the past by subcontractors..Daikan, Fujitsu, Mitsubishi etc.. I decided to try the Mr Cool version my self since no vacuum work is needed. Overall the install was fairly simple and straight forward. If you live in snow country like me, make a note while material planning that there is no wall mounting brackets, snow stands or roof covering included. I ordered a set of wall brackets on Amazon for less than $50 which, so far have worked out well. I also grabbed an inexpensive set of brackets on Amazon for mounting an aluminium panel above the unit to act as a water/snow shed.
I was not sure what the instructions are speaking to regarding the needed air switch? After speaking with (2) master electricians, they were unsure as well so I did not install one. I did however install an overload circuit protector on the breaker feeding the exterior unit to protect the delicate circuit board of the system.
The only head scratcher I had throughout the install process was the size of the receiving connector terminals for the Line 1 and Line 2 at the exterior unit. They are the same sized terminals as the small communication wire terminal connections from the indoor units. It was more work than necessary (imo) to connect the heavy feed wire(s) that link the exterior unit from the breaker. We got it connected, but I'm not sure why these terminals aren't designed larger?
I ordered longer length line sets than I measured and glad I did as there really wasn't a lot of slack left in the line sets when my wall units were all completed and installed. A good rule of thumb is more is better than less. One bit of advice I would give is find out how many ports your unit has for the option of future interior wall unit additions. In my case, I ordered a 27K BTU exterior condenser which had (3) ports. Included with my purchase kit was (2) interior units. Had I thought better of it, I would have attempted to order an upsized exterior unit for the potential to add another interior unit in my garage in the future, but my exterior unit only has 6K BTU's of unused capacity which is really not enough for my garage. I'll be ordering a separate unit for that in the future. I also plan to purchase another (2) systems to outfit the remainder of our two story colonial. Overall very pleased.

Kevin Myhre
Mr.Cool multizone install.

I have not completed the install yet and so this review will not be complete. So far all is going well. There are a few issues however. The first is that I was informed a wall mount bracket for the outside condenser unit would come with the order. It did not. This slowed the install as I had to wait for a bracket to come in. Next, the filler putty for the line set hole was nowhere near enough to fill the hole correctly. I would say at least double the amount sent would be needed to properly fill the gap for sealing. So far, other than these issues the install is going well. If you send me another review after the install I will give more info. As a last note I would say that I was disappointed in the exterior line set cover kit. It only comes in 12 foot lengths and all of my line sets are 16 feet. These kits are rather expensive and I did not want to buy 2 for every line set, and I have 3 line sets. That gets pretty pricey and it is a shame you don't sell line set kits for the different lengths of line set you sell. Thank you.



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